Hi all. In the process of building up the randomHR QGIS plugin[1], we stumbled across a more general question: which is the most appropriate metric for measuring overlap among HRs? Should it be:
1) area of overlapping / area occupied by at least one HR
2) area of overlapping / sum of areas of all HRs
3) N x area of overlapping / sum of areas of all HRs
(where N = number of overlapped HRs in given place)
4) something else
In the attached file, let's assume each square is 1ha big, so each range
is 2ha
big.
example A:
method 1) 1 / 3 = 33%
method 2) 1 / 4 = 25%
method 3) 2 / 4 = 50%
example B:
method 1) 1 / 4 = 25%
method 2) 1 / 6 = 17%
method 3) 3 / 6 = 50%
Opinions and suggestions welcome.
All the best.
--
Paolo Cavallini, see: * http://www.faunalia.it/pc *
[1] https://www.faunalia.it/dokuwiki/doku.php/public/animove_qgis_plugins
<<inline: overlap.png>>
_______________________________________________ AniMov mailing list [email protected] http://www.faunalia.com/cgi-bin/mailman/listinfo/animov
